VHS J1256–1257

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Coordinates: Sky map 12h 56m 02.15s, −12° 57′ 21.7″

VHS J125601.92–125723.9
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corvus
Right ascension 12h 56m 02.151s
Declination −12° 57′ 21.71″
Apparent magnitude (V) 17.759 ± 0.059[1]
Characteristics
VHS J1256–1257AB
Spectral type M7.5 ± 0.5[1]
VHS J1256–1257 b
Spectral type L7.0 ± 1.5[1]
Apparent magnitude (J) 16.662 ± 0.287[1]
Apparent magnitude (H) 15.595 ± 0.209[1]
Apparent magnitude (K) 14.568 ± 0.121[1]
Astrometry
Radial velocity (Rv)−1.4 ± 4.5[1] km/s
Proper motion (μ) RA: −272.0 ± 1.7[2] mas/yr
Dec.: −194.9 ± 2.1[2] mas/yr
Parallax (π)45.0 ± 2.4[2] mas
Distance72.4+3.6
−3.9 ly
(22.2+1.1
−1.2[2] pc)
Details[2]
VHS J1256–1257 AB
Mass94+10
−11 MJup
Luminosity (bolometric)0.0011±0.0002 (10−2.95 ± 0.07) L☉
Temperature2620±140[1] K
Rotation2.0782±0.0004 (A)
2.1342±0.0003 (B)[3]
Rotational velocity (v sin i)75.2+2.7
−2.3[4] km/s
Age150–300[1] Myr
VHS J1256–1257 b
Mass19±5 MJup
Radius1.13–1.21[5] RJup
Luminosity (bolometric)10−4.54 ± 0.07 L☉
Surface gravity (log g)4.55+0.15
−0.11 cgs
Temperature1240±50 K
Rotation22.04±0.05 h[5]
Rotational velocity (v sin i)13.5+3.6
−4.1[4] km/s
Age150–300[1] Myr
Position (relative to VHS J1256–1257AB)[1]
ComponentVHS J1256–1257 b
Epoch of observationMJD 55743.067635 (1 July 2011)
Angular distance8.06 ± 0.03″
Position angle218.1 ± 0.2°
Observed separation
(projected)		102 ± 9 AU
Other designations
VHS J1256–1257AB: 2MASS J12560215–1257217, TIC 2470992, SIPS J1256–1257, WDS J12560-1257A, WISE J125601.94–125723.7[6]
VHS J1256–1257 b: 2MASS J12560183–1257276, TIC 2470993, WDS J12560-1257B, WISEA J125601.66–125728.7[7]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

VHS J125601.92–125723.9 (abbreviated to VHS J1256–1257) is a young triple brown dwarf system located in the constellation Corvus approximately 72.4 light-years (22.2 parsecs) from the Sun.[2] The system consists of the equal-mass binary VHS J1256–1257AB and the distant planetary-mass companion VHS 1256–1257 b.[1][8] In 2022, a continuous radio emission from the radiation belts surrounding VHS J1256-1257, was detected.[9]

Outer companion[]

This planetary-mass companion was first identified and documented by the 2MASS survey in 2015.[1] It orbits at a distance of 102 ± 9 AU and has an estimated mass of approximately 19±5 times Jupiter's, which is below the minimum mass required for the thermonuclear fusion of deuterium.[10][11][12][2]

References[]

  1. ^ a b c d e f g h i j k l m Gauza, Bartosz; Béjar, Victor J. S.; Pérez-Garrido, Antonio; Zapatero Osorio, Maria Rosa; Lodieu, Nicolas; Rebolo, Rafael; et al. (May 2015). "Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9". The Astrophysical Journal. 804 (2): 18. arXiv:1505.00806. Bibcode:2015ApJ...804...96G. doi:10.1088/0004-637X/804/2/96. S2CID 118735358. 96.
  2. ^ a b c d e f g Dupuy, Trent J.; Liu, Michael C.; Magnier, Eugene A.; Best, William M. J.; Baraffe, Isabelle; Chabrier, Gilles; et al. (April 2020). "The Parallax of VHS J1256-1257 from CFHT and Pan-STARRS-1". Research Notes of the AAS. 4 (4). arXiv:2004.05180. Bibcode:2020RNAAS...4...54D. doi:10.3847/2515-5172/ab8942. S2CID 215744970. 54.
  3. ^ Miles-Páez, Paulo A. (2021). "Detection of photometric variability in the very low-mass binary VHS J1256-1257AB using TESS and Spitzer" (PDF). Astronomy & Astrophysics. arXiv:2004.05180. Bibcode:2021arXiv210700220M.
  4. ^ a b Bryan, Marta L.; Benneke, Björn; Knutson, Heather A.; Batygin, Konstatin; Bowler, Brendan P. (December 2018). "Constraints on the spin evolution of young planetary-mass companions" (PDF). Nature Astronomy. 2: 138–144. arXiv:1712.00457. Bibcode:2018NatAs...2..138B. doi:10.1038/s41550-017-0325-8. S2CID 119421455.
  5. ^ a b Zhou, Yifan; Bowler, Brendan P.; Morley, Caroline V.; Apai, Dániel; Kataria, Tiffany; Bryan, Marta L.; Benneke, Björn (August 2020). "Spectral Variability of VHS J1256-1257b from 1 to 5 μm" (PDF). The Astronomical Journal. 160 (2). arXiv:2004.05168. Bibcode:2020AJ....160...77Z. doi:10.3847/1538-3881/ab9e04. S2CID 215745742. 77.
  6. ^ "VHS J1256-1257 -- Low-mass star (M<1solMass)". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 1 July 2021.
  7. ^ "VHS J1256-1257B -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 July 2021.
  8. ^ Stone, Jordan M.; Skemer, Andrew J.; Kratter, Kaitlin M.; Dupuy, Trent J.; Close, Laird M.; Eisner, Josh A.; et al. (February 2016). "Adaptive Optics imaging of VHS 1256-1257: A Low Mass Companion to a Brown Dwarf Binary System". The Astrophysical Journal Letters. 818 (1): 5. arXiv:1601.03377. Bibcode:2016ApJ...818L..12S. doi:10.3847/2041-8205/818/1/L12. S2CID 118504775. L12.
  9. ^ Radio emission in a nearby ultracool dwarf binary: a multi-frequency study, 2022, arXiv:2201.12606
  10. ^ Rich, Evan A.; Currie, Thayne; Wisniewski, John P.; Hashimoto, Jun; Brandt, Timothy D.; Carson, Joseph C.; et al. (October 2016). "Thermal Infrared Imaging and Atmospheric Modeling of VHS J125601.92-125723.9 b: Evidence for Moderately Thick Clouds and Equilibrium Carbon Chemistry in a Hierarchical Triple System". The Astrophysical Journal. 830 (2): 10. arXiv:1607.06007. Bibcode:2016ApJ...830..114R. doi:10.3847/0004-637X/830/2/114. S2CID 119221162. 114.
  11. ^ Miles, Brittany E.; Skemer, Andrew J.; Barman, Travis S.; Allers, Katelyn N.; Stone, Jordan M.; et al. (December 2018). "Methane in Analogs of Young Directly Imaged Exoplanets". The Astrophysical Journal. 869 (1): 11. arXiv:1810.04684. Bibcode:2018ApJ...869...18M. doi:10.3847/1538-4357/aae6cd. S2CID 113400693. 18.
  12. ^ Bowler, Brendan P.; Zhou, Yifan; Morley, Caroline V.; Kataria, Tiffany; Bryan, Marta L.; Benneke, Björn; Batygin, Konstatin (April 2018). "Strong Near-infrared Spectral Variability of the Young Cloudy L Dwarf Companion VHS J1256-1257 b". The Astrophysical Journal Letters. 893 (2): 7. arXiv:2004.05170. Bibcode:2020ApJ...893L..30B. doi:10.3847/2041-8213/ab8197. S2CID 215745306. L30.

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